# Quantcast: Quantcast specializes in audience management and real time advertising offering public access to traffic and demographic data for millions of web sites. It provides free and exact audience measurements to more than 100 million web and mobile websites.

# Socialmention: Socialmention is a social media search engine that allows you to view the comments about you or your company, a new product or anything trending on the social media sites in real time. It monitors more than 100 social media websites that includes popular ones like the Facebook, twitter and Google.

# Technorati: Technorati is an internet search engine that helps to search blogs. This search engine has marked nearly 112 million blogs on its site, and has over 250 million pages linked to the social media sites. It also has a popular list of what is trending over the web including books, movies and blogs as the main categories. Technorati links the blogs by actually using the tags that authors have included on their websites to categorize the search results where the most recent ones will appear on top.

# Topsy: Topsy is a social search and Analytics Company that is a certified twitter partner keeping a complete index of tweets. The search engine can help search, analyze and discover how often things are tweeted about. Some of the largest marketing, news and financial organizations to get real time updates about the questions asked information on the breaking news, market status and many more use Topsy.

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